- the progress icon in the IDE selection combo box was not
  spinning while IDEs were loading.
- there were two reasons:
    1. the combobox did not enable animated icons in the
    renderer
    2. the cell renderer implementation did not repaint
   the icon
- resolves #4

- the progress icon in the IDE selection combo box was not
  spinning while IDEs were loading.
- there were two reasons:
    1. the combo box did not enable animated icons in the
    renderer
    2. the cell renderer implementation did not repaint
   the icon
- resolves #4

- the IDEs combo box is no longer stuck with the text "Retrieving
  products.." if an exception happens in the code.
- instead, exceptions are handled a new custom combo box renderer
  is installed that tells the user that an error was encountered
  while retrieving the IDEs.
- resolves #10